Apparatus and methods for monitoring embryos in an incubator are described. The apparatus comprises an incubation chamber defined by an incubation chamber housing and a sample platform comprising a plurality of receptacles for holding embryos within the incubation chamber for incubation. The sample platform may comprise a slide carrier on which embryo slides containing the receptacles may be placed incubation. The sample platform is rotatable about a rotation axis relative to the incubation chamber housing so as to allow receptacles to be selectively rotated to a monitoring position that is aligned with a viewing port provided in the incubation chamber housing, for example an opening or window. An imaging device is located outside the incubation chamber and arranged to image embryos within the incubation chamber at the monitoring position through the viewing port.